NEW YORK — The price to board an airliner in the United States has risen for the fourth straight year, making it increasingly expensive to fly almost anywhere.

The average domestic roundtrip ticket, including tax, reached $363.42 last year, up more than $7 from the prior year, according to an Associated Press analysis of travel data collected from millions of flights throughout the country.

Airfares have risen nearly 12 percent since their low in the depths of the Great Recession in 2009, when adjusted for inflation, the analysis showed.

Now, 84 percent of seats are filled with paying passengers, up from 82 percent in 2009.

“Anyone traveling today will know that those flights are full,” said Chuck Thackston, managing director of data and analytics for the Airlines Reporting Corp, which processes ticket transactions for airlines and more than 9,400 travel agencies. “Just through supply and demand, those fares will go up.”

And none of this factors in the bevy of extra fees that travelers now face.

A customer dining at Washington’s Oceanaire restaurant noticed an unusual line at the bottom of his receipt: “Due to the rising costs of doing business in this location, including costs associated with higher minimum wage rates, a 3% surcharge has been added to your total bill.”